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232 lines
6.5 KiB
232 lines
6.5 KiB
/*
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* linux/include/linux/sunrpc/clnt_xprt.h
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*
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* Declarations for the RPC transport interface.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _LINUX_SUNRPC_XPRT_H
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#define _LINUX_SUNRPC_XPRT_H
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#include <linux/uio.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/xdr.h>
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/*
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* The transport code maintains an estimate on the maximum number of out-
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* standing RPC requests, using a smoothed version of the congestion
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* avoidance implemented in 44BSD. This is basically the Van Jacobson
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* congestion algorithm: If a retransmit occurs, the congestion window is
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* halved; otherwise, it is incremented by 1/cwnd when
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*
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* - a reply is received and
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* - a full number of requests are outstanding and
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* - the congestion window hasn't been updated recently.
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*
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* Upper procedures may check whether a request would block waiting for
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* a free RPC slot by using the RPC_CONGESTED() macro.
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*/
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extern unsigned int xprt_udp_slot_table_entries;
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extern unsigned int xprt_tcp_slot_table_entries;
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#define RPC_MIN_SLOT_TABLE (2U)
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#define RPC_DEF_SLOT_TABLE (16U)
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#define RPC_MAX_SLOT_TABLE (128U)
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#define RPC_CWNDSHIFT (8U)
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#define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT)
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#define RPC_INITCWND RPC_CWNDSCALE
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#define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT)
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#define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
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/* Default timeout values */
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#define RPC_MAX_UDP_TIMEOUT (60*HZ)
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#define RPC_MAX_TCP_TIMEOUT (600*HZ)
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/*
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* Wait duration for an RPC TCP connection to be established. Solaris
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* NFS over TCP uses 60 seconds, for example, which is in line with how
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* long a server takes to reboot.
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*/
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#define RPC_CONNECT_TIMEOUT (60*HZ)
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/*
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* Delay an arbitrary number of seconds before attempting to reconnect
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* after an error.
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*/
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#define RPC_REESTABLISH_TIMEOUT (15*HZ)
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/* RPC call and reply header size as number of 32bit words (verifier
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* size computed separately)
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*/
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#define RPC_CALLHDRSIZE 6
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#define RPC_REPHDRSIZE 4
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/*
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* This describes a timeout strategy
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*/
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struct rpc_timeout {
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unsigned long to_initval, /* initial timeout */
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to_maxval, /* max timeout */
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to_increment; /* if !exponential */
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unsigned int to_retries; /* max # of retries */
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unsigned char to_exponential;
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};
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/*
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* This describes a complete RPC request
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*/
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struct rpc_rqst {
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/*
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* This is the user-visible part
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*/
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struct rpc_xprt * rq_xprt; /* RPC client */
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struct xdr_buf rq_snd_buf; /* send buffer */
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struct xdr_buf rq_rcv_buf; /* recv buffer */
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/*
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* This is the private part
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*/
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struct rpc_task * rq_task; /* RPC task data */
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__u32 rq_xid; /* request XID */
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int rq_cong; /* has incremented xprt->cong */
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int rq_received; /* receive completed */
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u32 rq_seqno; /* gss seq no. used on req. */
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struct list_head rq_list;
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struct xdr_buf rq_private_buf; /* The receive buffer
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* used in the softirq.
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*/
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unsigned long rq_majortimeo; /* major timeout alarm */
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unsigned long rq_timeout; /* Current timeout value */
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unsigned int rq_retries; /* # of retries */
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/*
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* For authentication (e.g. auth_des)
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*/
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u32 rq_creddata[2];
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/*
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* Partial send handling
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*/
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u32 rq_bytes_sent; /* Bytes we have sent */
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unsigned long rq_xtime; /* when transmitted */
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int rq_ntrans;
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};
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#define rq_svec rq_snd_buf.head
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#define rq_slen rq_snd_buf.len
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#define XPRT_LAST_FRAG (1 << 0)
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#define XPRT_COPY_RECM (1 << 1)
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#define XPRT_COPY_XID (1 << 2)
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#define XPRT_COPY_DATA (1 << 3)
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struct rpc_xprt {
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struct socket * sock; /* BSD socket layer */
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struct sock * inet; /* INET layer */
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struct rpc_timeout timeout; /* timeout parms */
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struct sockaddr_in addr; /* server address */
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int prot; /* IP protocol */
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unsigned long cong; /* current congestion */
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unsigned long cwnd; /* congestion window */
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unsigned int rcvsize, /* socket receive buffer size */
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sndsize; /* socket send buffer size */
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size_t max_payload; /* largest RPC payload size,
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in bytes */
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struct rpc_wait_queue sending; /* requests waiting to send */
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struct rpc_wait_queue resend; /* requests waiting to resend */
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struct rpc_wait_queue pending; /* requests in flight */
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struct rpc_wait_queue backlog; /* waiting for slot */
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struct list_head free; /* free slots */
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struct rpc_rqst * slot; /* slot table storage */
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unsigned int max_reqs; /* total slots */
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unsigned long sockstate; /* Socket state */
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unsigned char shutdown : 1, /* being shut down */
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nocong : 1, /* no congestion control */
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resvport : 1, /* use a reserved port */
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stream : 1; /* TCP */
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/*
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* XID
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*/
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__u32 xid; /* Next XID value to use */
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/*
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* State of TCP reply receive stuff
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*/
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u32 tcp_recm, /* Fragment header */
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tcp_xid, /* Current XID */
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tcp_reclen, /* fragment length */
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tcp_offset; /* fragment offset */
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unsigned long tcp_copied, /* copied to request */
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tcp_flags;
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/*
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* Connection of sockets
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*/
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struct work_struct sock_connect;
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unsigned short port;
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/*
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* Disconnection of idle sockets
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*/
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struct work_struct task_cleanup;
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struct timer_list timer;
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unsigned long last_used;
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/*
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* Send stuff
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*/
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spinlock_t sock_lock; /* lock socket info */
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spinlock_t xprt_lock; /* lock xprt info */
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struct rpc_task * snd_task; /* Task blocked in send */
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struct list_head recv;
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void (*old_data_ready)(struct sock *, int);
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void (*old_state_change)(struct sock *);
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void (*old_write_space)(struct sock *);
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wait_queue_head_t cong_wait;
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};
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#ifdef __KERNEL__
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struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr,
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struct rpc_timeout *toparms);
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int xprt_destroy(struct rpc_xprt *);
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void xprt_set_timeout(struct rpc_timeout *, unsigned int,
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unsigned long);
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void xprt_reserve(struct rpc_task *);
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int xprt_prepare_transmit(struct rpc_task *);
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void xprt_transmit(struct rpc_task *);
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void xprt_receive(struct rpc_task *);
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int xprt_adjust_timeout(struct rpc_rqst *req);
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void xprt_release(struct rpc_task *);
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void xprt_connect(struct rpc_task *);
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void xprt_sock_setbufsize(struct rpc_xprt *);
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#define XPRT_LOCKED 0
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#define XPRT_CONNECT 1
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#define XPRT_CONNECTING 2
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#define xprt_connected(xp) (test_bit(XPRT_CONNECT, &(xp)->sockstate))
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#define xprt_set_connected(xp) (set_bit(XPRT_CONNECT, &(xp)->sockstate))
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#define xprt_test_and_set_connected(xp) (test_and_set_bit(XPRT_CONNECT, &(xp)->sockstate))
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#define xprt_test_and_clear_connected(xp) \
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(test_and_clear_bit(XPRT_CONNECT, &(xp)->sockstate))
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#define xprt_clear_connected(xp) (clear_bit(XPRT_CONNECT, &(xp)->sockstate))
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#endif /* __KERNEL__*/
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#endif /* _LINUX_SUNRPC_XPRT_H */
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